1. What is DP cable used for transmission of electric energy, information and electromagnetic energy conversion? 2. There is no clear boundary, which is commonly known as 2. DP cables are classified into three categories:

(1) power DP cables -- DP cables used in the power system mainly include overhead naked wires, power cables, and DP cables for electrical equipment, etc.

(5) power cables -- insulated, armored and protected (under five cores, with complex structure). The products are mainly used for the transmission of strong electric power in the transmission, distribution, transmission, transformation and power supply lines, with large current (tens to thousands of amps) and high voltage (220V to 500kV and above).